1913.] NATURAL SCIENCES OF PHILADELPHIA. 655 



exaggerated growth lines below, and very indistinct, rather distant, 

 spiral incised lines which become fairly well marked on the base and 

 part of the last whorl, producing low, flattened costse; sutures 

 slightly impressed. Apex eroded in all specimens; greatest number 

 of whorls persisting 5|. Aperture oblique, pyriform, bluish-white 

 within, the external black spots showing through when they are 

 present; outer and lower lips thin and sharp, lower lip much produced 

 and curving sharply and smoothly into the base of the columella; 

 more mature specimens with a dense, but limited callus on the 

 parietal wall above the strongly concave and slightly revolute 

 columella. 



The type with 4| whorls measures, alt. 35, diam. 13, length of 

 aperture 15.5 mm. 



The longest specimen with 5^ whorls measures alt. 38.5, diam. 

 13.25 mm. 



This species, which seems to be new, is related to D. heathi from 

 which it differs by its smaller size and lighter weight, more regular 

 form and more slender shape, and by the absence of the microscopic 

 spiral lines which are very characteristic of the latter species. There 

 is a tendency to a somewhat similar change of sculpture on the final 

 whorl. More mature specimens may show the present species to be 

 only a variety of D. heathi. 



Five specimens, varying somewhat in shape, but of nearly the same 

 apparent age, come from the Rio Jary at St. Antonio da Cachoeira. 

 The species is named for Dr. Hermann von Ihering, of the Museu 

 Paulista at Sao Paulo, Brazil, 



Doryssa cachoeirae n. sp. PI. XXV, fig. 9. 



Shell very regularly turreted conic, of medium weight, with a dense 

 epidermis varying from light yellow-olive in young shells to appar- 

 ently nearly black in those more mature; everywhere marked with 

 small, irregularly placed and shaped spots, which occasionally 

 coalesce to form longitudinal stripes, these spots well defined in young 

 shells, but only perceptible by transmitted light in the older and 

 darker ones; all specimens everywhere marked with fine, close 

 incised spiral striae, barely perceptible with the naked eye, and 

 overlying about nine low, broad, flattened, nearly equal spiral cords 

 which cover the whole base of the more mature specimens; apical 

 angle about 35 degrees; nepionic whorls eroded in all specimens, 

 but probably not more than three, slightly roughened, but without 

 defined sculpture, and, beginning rather abruptly on the postnepionie 

 whorls, the rather regular growth lines are soon decussated by the 



